Nanaya>Ryougi>Tohno....I mean come on who doesn't like how he goes berserk hes freaking godly and Ryougi well....she is just really kawaii XD seriously though, her background is just as interesting as with tohno/nanaya. This leaves Tohno at the end....well he is a pretty "normal" guy so yeah....

Tohno is the best ouit of both Ryougi and nanaya because of the simple fact is that he uses his brain when he fights and he get results instead on realying on blood impluses/ killer insticts like Nanaya and Ryougi like to do oh so very well